#include <key.h>

unsigned char Key_read()
{
	unsigned char temp=0;
	P44=0;P42=1;P35=1;P34=1;
	if(P33==0)  temp=4;
	if(P32==0)  temp=5;
	if(P31==0)  temp=6;
	if(P30==0)  temp=7;
	return temp;

}